CONTROLLED DELIVERY DRIVE MECHANISMS FOR DRUG DELIVERY PUMPS

摘要

A controlled delivery drive mechanism includes a drug container having a barrel and a plunger seal; a drive housing within which at least initially partially resides a piston having an interface surface and a drive rack; and a power spring. The piston is configured to contact and axially translate the plunger seal within barrel. The mechanism may be configured to convert rotational movement of a drive pinion to axial translation of the drive rack, or to convert axial force of a linear power spring into torsional motion of a drive pinion. A regulating mechanism meters the drive pinion such that the piston is axially translated at a controlled rate. The drug container may contain a drug fluid within a drug chamber for drug delivery at a controlled rate. The regulating mechanism may be an escapement regulating mechanism. A drug delivery pump includes such controlled delivery drive mechanisms.

主权项

1. A controlled delivery drive mechanism comprises: a drug container having a barrel and a plunger seal; a drive housing within which at least initially partially resides a piston having an interface surface and a drive rack; a power spring coupled, directly or indirectly, to a drive pinion which interfaces with drive rack of the piston to convert rotational movement of power spring and the drive pinion to axial translation of the drive rack, wherein the piston is configured to contact and axially translate the plunger seal within barrel, and wherein a regulating mechanism meters the drive pinion such that the piston is axially translated at a controlled rate.